Theme, child themes and wp-admin alerts

Hello back with another rookie question, well two, the wp admin gives me an alert message that I need to activate a buddypress compatible theme even though I have blogs-mu installed any answers to why?

Second question, I created a child theme for blogs-mu, but I can not seem to override the styles, is there something in the theme-options that won't allow a path rewrite to my child theme files?

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